Braking device



April'5, 1932. 7 FM. SARFF 1,852,904

' BRAKING QEYICE Filed Feb. 26. 1950 2 Sheets-Sheet 2 INVENTOR.

F. IT]. SFTRFF Patented Apr. 5, 1932 ronns'r M. SAIRFF, OFLOS Antennas,CALIFORNIA,

BRAKING DEVICE 7 Application filed l ebruary 26,v 1930; Serial No.431,533.

This invention-relates to improvements in braking devices and hasparticular reference to a booster arrangement whereby increased brakingpower may be readily obtained without undue efi'ort upon the part of theuser.

Another object is to produce a device wherein mechanical braking powermay be obtained through the movement of the vehicle upon which thedevice is positioned.

A further object is to produce a device which may be attached to theordinary motor vehicle railroad car or any device using brakes.

A still'further object is to produce a device which is simple inconstruction and positive in operation.

Other objects and advantages will beapparent during the course of thefollowing description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame,

Figure I is a cross sectional view taken on. the line 1-1 of Figure II,and showing the rockerplate in dotted lines,

' a foot pedal or lever and depending upon the amount of pressure thebraking is controlled.

Furthermore it has been often necessary to apply excessive pressure withthe result that many operators found it difficult to brake a vehicle intraffio without "necessitating extreme effort. Applicant has thereforeproduced a device which will eliminate this difficulty.

In the accompanying drawings wherein for the purpose of illustration isshown a preferred embodiment of my invention, the

numeral '5' designates the propeller shaft at o a point between thetransmission and the universal housing 6. To thev universal housing a issecured a drum 7 as by bolts 8 and 9. This drum issurrounded by a brakeband 11 carrying a brakelining 12. In order to mount this brake band Iprovide a pair of ofiset ears 18 through which a pivot :pin 14; passes.This pivot pin is carried in an actuatingarm 16. The opposite ends ofthe band are connected through the medium of threaded bolts 17 and 18 topins 19 and 21 respectively. The pins 19 and 21 are carried in a rockerplate 22 which is rotatably positioned upon a collar 23 which is securedby bolts 24 to the transmission housing '26. The actuating lever 16 is"slidably held in a slot-27 formed in the rocker plate by a pin 28. Theposition of this pin may be adjusted by a set screw 29 having a lock nut31.

The actuating lever 16'has springs 32fand 33 connected to the endthereof for the purpose of maintaining'the lever in its normal positionof'Figure I. A link 34 ispivoted as at .36 to: the actuating lever 16and in turn is. pivoted at 37 to the lower portion 38 to the 'foot brake39 which is fulcrumed as at 41'.

The rocker plate has pivoted thereto as at '42- a link43 which ispivoted as at 44 to the brake actuating arm 46. e

In the modified form shown in Figures III and :IV thepropeller shaft isshown at 47 the transmission housing at 48, the universal" joint housingat 49iand corresponds to the one show-n in Figures I and II. To thehousing 48 is secured a collar :51 upon which is rotatably supported thefemalemember 52 of a cone clutch to the inner surface of which issecured afriction material 53. The male member is shown'at 54 and issecured by bolts 56 to the universal housing so asto rotate with theshaft 47. Pivoted at 57 is an actuating yoke 58 having rollers 59 whichengage. the collar 61 formed upon the clutch member' 52. The link 62 isconnected to the back pedal and is normally held in retracted positionby thespring 63. A link 64 is connected to the clutch member 52andcorresponds to the link 43 of :oFi-gure I. v

The construction shown in Figure IV is exactly the same as that shown inFigure III with the exception that the clutch members are of the disctype instead of being cone.-

shaped These clutch members are given the numerals 66 and 67 whichcorrespond to the clutch members 52 and 53 respectively. As the otherparts are identical both in construction and operation the same numeralsapply thereto.

The operation of my device is as follows Assuming that the same has beensecured upon a motor vehicle an d that the same is under movement so asto rotate the shaft 5 and consequently the drum 7 and it is desired toapply the brakes the foot pedal is pushed so as to cause rearwardmovement of the pivot point 37 The action will move the actuating lever16 rearwardly through its sliding connection with the rocker plate 22and will bring the center portion of the brake lining 12 against thedrum 7 and assuming that the drum 7 is moved in a counter-clockwisedirection the brake band will tend to move in the same direction causingthe rocker plate to rotate counter-clockwise. As a result the pivotpoint 42 will move upwardly drawing upon the link 43 and brake lever 46thus it is merely necessary to push the foot pedal with a light pressurein order to accomplish a very positive braking action. As soon as thefoot is removed by the brake pedal the springs 32 and 33 will return theparts to their normal position. The wear upon the brake band is taken upthrough wing nuts in a manner which is obvious. In the forms shown inFigures III and IV, action is the same with the exception that cone typeand disc type clutches are employed instead of adrum.

It is to be understood that the form of my invention herewith. shown anddescribed is to be taken as a preferred example and that various changesrelative to the material, size, shape and arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the subjoined claims.

Having thus described my invention, I claim 1. In a device of thecharacter described, a rotating drum, a rocker plate positioned adjacentsaid drum, means for normally maintaining said plate in fixed position,a brake band having its ends carried by said plate, an actuating leverslidable in said rocker plate and secured to said brake band at itsmedial point, a link secured to said plate and having its opopsite endsecured to a brake lever and means for moving said actuating leverlaterally for the purpose of bringing the medial portion of said brakeband into engagement with said drum whereby said rocker plate will begiven a partial rotation for the purpose specified.

2. In a braking mechanism for motor vehicles, the combination of arotating drum mounted on said motor vehicle, of a rocker platepositioned adjacent said drum, means for normally maintaining said platein a fixed position, a slot formed in said plate, a brake bandsurrounding said drum and havin its ends secured to one end of saidrocker pIate, a lever slidably mounted in said slot, said lever beingpivotally connected to the medial portion of said band, a link securedto said rocker plate at a point midway between the connection of the endof said band and said plate, said link having its free ends secured tothe braking mechanism of the motor vehi cle and means for moving saidlever in said slot whereby the medial portion of said band will contactsaid drum to cause rotation of said plate in the same direction saiddrum is rotating for the purpose specified.

In testimony whereof I affix my signature.

FOREST M. SARFF.

